CD40LG and hepatitis A virus infection: Serum was sent for human immunodeficiency virus, hepatitis panel, Bartonella henselae, Quintana IgG and IgM antibodies (ab), Blastomyces ab, Brucella abortus ab, Coccidioides ab, Chlamydia burnetii ab, Cryptococcus antigen (ag), Cytomegalovirus ab, Epstein Barr virus ab, Urine Histoplasma ag, Parvovirus ab, and Toxoplasma ab and all came back negative.